add erp5 package description files

erp5_/erp5.json

+{
+  "name": "erp5_officejs_onlyoffice_sdkjs",
+  "description": "sdkjs - core of OnlyOffice project.",
+  "authors": [
+    "Ascensio System SIA 2017"
+  ],
+  "license": "GNU AGPL v3.0",
+  "scopes": [
+    {
+      "prefix": "onlyoffice/sdkjs/",
+      "paths": [
+        "common/",
+        "cell/",
+        "word/",
+        "slide/"
+      ]
+    }
+  ]
+}
\ No newline at end of file

erp5_/index.appcache

+---
+---
+CACHE MANIFEST
+CACHE:
+{% assign s_files = site.static_files | where_exp: "file", "file.exclude != true"  %}{% for file in s_files %}{{ file.path | remove_first: "/"}}
+{% endfor %}
\ No newline at end of file